BusOut_HelloWorld - BusOut Hello World

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mbed_example / Mbed OS BusOut_HelloWorld

BusOut Hello World

Use

The BusOut interface can be used to create an artificial bus of pins out of any digital ins. The pins do not have to have sequential hardware addressing. This example program counts up from 0 to 15 or binary 0000 to 1111 . The effect of this is turning LED1-LED4 on or off according to the number going across the bus. The example code toggles LED's on / off, if a tricolor led is on the board then the led will change colors.

Integer	binary	LED On(1) / Off(0)
0	0000	LED4=0 LED3=0 LED2=0 LED1=0
1	0001	LED4=0 LED3=0 LED2=0 LED1=1
2	0010	LED4=0 LED3=0 LED2=1 LED1=0
3	0011	LED4=0 LED3=0 LED2=1 LED1=1
4	0100	LED4=0 LED3=1 LED2=0 LED1=0
5	0101	LED4=0 LED3=1 LED2=0 LED1=1
6	0110	LED4=0 LED3=1 LED2=1 LED1=0
7	0111	LED4=0 LED3=1 LED2=1 LED1=1
8	1000	LED4=1 LED3=0 LED2=0 LED1=0
9	1001	LED4=1 LED3=0 LED2=0 LED1=1
10	1010	LED4=1 LED3=0 LED2=1 LED1=0
11	1011	LED4=1 LED3=0 LED2=1 LED1=1
12	1100	LED4=1 LED3=1 LED2=0 LED1=0
13	1101	LED4=1 LED3=1 LED2=0 LED1=1
14	1110	LED4=1 LED3=1 LED2=1 LED1=0
15	1111	LED4=1 LED3=1 LED2=1 LED1=1

Note

When initializing a BusOut object you initialize pins in their bit order from right to left, be careful as the bit order is the reverse of the object initializing order.

// init object
BusOut thingy(pin0,pin1,...,pin15)

// use object
thingy = (val15<<15 | ... | val1 <<1 | val0 <<0) ; // where valx corresponds to the value to be put onto pinx